Stereoselective Synthesis and Cytoselective Toxicity of Monoterpene-Fused 2-Imino-1,3-thiazines
作者:Zsolt Szakonyi、István Zupkó、Reijo Sillanpää、Ferenc Fülöp
DOI:10.3390/molecules191015918
日期:——
Starting from pinane-, apopinane- and carane-based 1,3-amino alcohols obtained from monoterpene-based β-amino acids, a library of monoterpene-fused 2-imino-1,3-thiazines as main products and 2-thioxo-1,3-oxazines as side-products were prepared via two- or three-step syntheses. When thiourea adducts prepared from 1,3-amino alcohols and aryl isothiocyanates were reacted with CDI under mild conditions, O-imidazolylcarbonyl intermediates were isolated which could be transformed to the desired 1,3-thiazines under microwave conditions. 1,3-Thiazines and 2-thioxo-1,3-oxazine side-products could also be prepared in one-step reactions through the application of CDI and microwave irradiation. The ring-closure process was extended to cycloalkane-based γ-hydroxythioureas. The carane- and apopinane-based derivatives exhibited marked antiproliferative activity against a panel of human adherent cancer cell lines (HeLa, A2780, MCF7 and A431).
以基于单萜的β-氨基酸获得的蒎烷、阿蒎烷和卡烷为基础的1,3-氨基醇为原料,以单萜稠合的2-亚氨基-1,3-噻嗪为主要产品,并以2-硫代-通过两步或三步合成制备副产物 1,3-恶嗪。当由1,3-氨基醇和异硫氰酸芳基酯制备的硫脲加合物与CDI在温和条件下反应时,分离出O-咪唑基羰基中间体,该中间体可以在微波条件下转化为所需的1,3-噻嗪类化合物。 1,3-噻嗪和2-硫代-1,3-恶嗪副产物也可以通过CDI和微波辐射的一步反应制备。闭环过程扩展到基于环烷烃的γ-羟基硫脲。基于carane和apopinane的衍生物对一组人类贴壁癌细胞系(HeLa、A2780、MCF7和A431)表现出显着的抗增殖活性。